Iowa DNR
BioNet
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

Unnamed Tributary to Pine Creek N of Volga (Volga_Nagle_51)

Fish Session #933

Sample Date
8/1/2024
Timeframe
1579 seconds of backpack EF effort
Reach Size
270 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
10/11/2024 10:38:51 AM

Fish Health

# DELTs
0
# Non-DELTs
0

Equipment

Backpack Shockers
1
Blocknets
0
This sampling session was collected as part of the FishNet program.
Notice: This sampling session has not been through a Quality Assurance check and may contain errors. This notice will be removed once the QA has been completed.
Property Access Notice

This site is on privately-owned land. The DNR obtains permission from the landowner(s) prior to conducting any sampling surveys.

FIBI Score
74
Warm Water
Excellent
Session Comments

water temperature of 62 degrees conductivity was 668 µs/cm backpack EF unit set on 90/25 130V 2A

Collected Fish

Identity verification status for this species
Morphometrics: Length/Weight measurements of individual specimens
Taxa excluded from species count metrics.
Click on species name for more information about that species
Species Catch
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
55
Western Blacknose Dace
Latin: Rhinichthys obtusus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
44
Johnny Darter
Latin: Etheostoma nigrum
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
35
Southern Redbelly Dace
Latin: Chrosomus erythrogaster
Family: Leuciscidae
Tolerance: Sensitive
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
27
Stoneroller spp.
Latin: Campostoma spp.
Family: Leuciscidae
Tolerance: N/A
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
16
Fantail Darter
Latin: Etheostoma flabellare
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
10
Brook Stickleback
Latin: Culaea inconstans
Family: Gasterosteidae
Tolerance: Sensitive
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 1.4900
Log(DA) 0.1732
Total Fish 191
Fish per 500 ft 354
Total Species 8
# Excluded Species 0
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 10/28/2025 7:04:37 AM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 8 10
Sucker Species 1 10
Sensitive Species 2 10
Benthic Invertivore Species 2 10
Top 3 Abundance Percentage 70.16 10
Benthic Invertivore Percentage 23.56 10
Omnivore Percentage 0.52 10
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 5.71 6.81
Adjusted Catch per Unit Effort 44.44 4.44
DELT Percentage Adjustment 0 0

FIBI Score Explained

Sites that score between 71 - 100 are considered excellent. Fish (excluding tolerant species) are fairly abundant or abundant. A high number of native species are present, including many long-lived, habitat specialist, and sensitive species. Sensitive fish species and species of intermediate pollution tolerance are numerically dominant. The three most abundant fish species typically comprise 50% or less of the total number of fish. Top carnivores are usually present in appropriate numbers and multiple life stages. Habitat specialists, such as benthic invertivore and simple lithophilous spawning fish are present at near optimal levels. Fish condition is good; typically less than 1% of total fish exhibit external anomalies associated with disease or stress.

This location has been classified as a survey site. Survey sites are compared to reference sites within the same ecoregion. A reference site represents natural stream qualities that are least disturbed by human activities within the watershed. Reference sites are grouped by ecoregion to establish a benchmark against which these survey streams are compared.

EcoRegion Comparison

Scores for a sampling session are compared against reference sites within the same ecoregion:

Paleozoic Plateau (Driftless Area)

This site is in the Paleozoic Plateau (Driftless Area) ecoregion.

Ecoregion Map
Max 91
75th Percentile 63
Median 53
25th Percentile 47
Min 9
This Session's Score 74
Total Reference Site Samples 118
Mean 55.41
Standard Deviation 15.95